The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

A long abandoned hospital building on the outskirts of NYC.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A recently abandoned psych ward at the end of Sanatorium Road.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

An abandoned asylum where patients have been forgotten but their possessions remain.